I've noticed when I am running distances (few or more miles) at cruising speed one of my tachometer is not reading the correct rpms, meaning, at around 3600 rpm (gauging this by my other motor and the similarities in sound) my gauge in question will read +/- 5000 rpm or so and has erratic movements but will sometimes go back to normal for a brief period of time. On short runs (hour or less running time) I do not see this problem nor do I see this under 3000 rpms.
my motors are twin 180 hp 3/7 liter mercuisers One has the retro fit alternator and one has the old stator/voltage regulator setup. Both have pertronix ignition setups
The one with the stator is the one giving me these issues.
The same engine also seemed to studder slightly when I am seeing this issue.
I'm assuming it's the voltage regulator going bad and when it gets hot it starts to fail but then recovers when the heat of the labouring motor backs off when I back off the engine or somehow it's drawing a heavier current when the motor sees these conditions.
I'm an Industrial electronics guy by trade so i'm not a babe in the woods in this situation.. I wanted to see what others think or have had seen in the past or if they have had this issue and to see what their solution was.
anybody?
my motors are twin 180 hp 3/7 liter mercuisers One has the retro fit alternator and one has the old stator/voltage regulator setup. Both have pertronix ignition setups
The one with the stator is the one giving me these issues.
The same engine also seemed to studder slightly when I am seeing this issue.
I'm assuming it's the voltage regulator going bad and when it gets hot it starts to fail but then recovers when the heat of the labouring motor backs off when I back off the engine or somehow it's drawing a heavier current when the motor sees these conditions.
I'm an Industrial electronics guy by trade so i'm not a babe in the woods in this situation.. I wanted to see what others think or have had seen in the past or if they have had this issue and to see what their solution was.
anybody?